update error message

Author: Cyan4973

programs/fileio.c

@@ -659,9 +659,10 @@ FIO_openDstFile(FIO_ctx_t* fCtx, FIO_prefs_t* const prefs,
         }
 #endif
         if (f == NULL) {
-            DISPLAYLEVEL(1, "zstd: %s: %s\n", dstFileName, strerror(errno));
             if (UTIL_isFileDescriptorPipe(dstFileName)) {
-                DISPLAYLEVEL(1, "When using process substitution (<(...)), specify an output destination with -o or -c. \n");
+                DISPLAYLEVEL(1, "zstd: error: no output specified (use -o or -c). \n");
+            } else {
+                DISPLAYLEVEL(1, "zstd: %s: %s\n", dstFileName, strerror(errno));
             }
         } else {
             /* An increased buffer size can provide a significant performance

tests/cli-tests/file-stat/compress-file-to-dir-without-write-perm.sh.stderr.exact

@@ -22,7 +22,7 @@ Trace:FileStat: > UTIL_isRegularFile(out/file.zst)
 Trace:FileStat:  > UTIL_stat(-1, out/file.zst)
 Trace:FileStat:  < 0
 Trace:FileStat: < 0
-zstd: out/file.zst: Permission denied
 Trace:FileStat: > UTIL_isFileDescriptorPipe(out/file.zst)
 Trace:FileStat: < 0
+zstd: out/file.zst: Permission denied
 zstd: can't stat out/file.zst : Permission denied -- ignored